His invasion onto the Wembley field stopped played as several members of staff tried to stop him.
While he managed to get away from two stewards, he knocked a third to the ground.
At one point he also got incredibly close to Italy’s goalkeeper Gianluigi Donnarumma, but a fourth member of staff was eventually able to stop him.
Before his stunt on the pitch, the singer could be seen celebrating Luke Shaw’s goal two minutes in on social media.
Adam was a part of the band New Priority on Little Mix: The Search last year.
The five-piece boyband was made up of Adam, Kaci Brooks, Talis Eros, Zeekay and Lee Collinson.
The boys impressed Perrie Edwars, Leigh-Anne Pinnock, Jade Thirlwall and Jesy Nelson, but they ultimately lost out to winners Since September.
Following his pitch invasion, Adam took to social media to brag about his stunt and describe the incident as “fun”.
Sharing a clip of himself running onto the pitch on his Instagram Stories, he wrote alongside it: “Well that was fun…”.
He added a series of crying with laughter emojis to the post which went out to his 42,000 followers.
At the end of the day…. I love my country and I did this all for a good time. Nothing but love and respect for England tonight. BIG LOVE PEOPLE Always."
Adam wore a red England shirt to the game and sported blonde locks.
Since September won the chance to support Little Mix on their next tour.
Bandmate Jesy Nelson was absent from the final of the BBC One programme, with host Chris Ramsey explaining the star had had to pull out due to illness.
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Five weeks later Jesy made the announcement that she was leaving Little Mix for the sake of her mental health in a statement on Instagram.
Opening up about her decision to leave earlier this year, the 30 year old said being constantly compared to her three other bandmates took a toll.
She told Cosmoplitan: "I was bigger than the other three, and there's never really been that in a girl group.
"I was classed as the obese, fat one. I can't believe how miserable I was.”
Jesy added that her breaking point whilst she was on set for the music video of Sweet Melody last year.
She explained: "We'd been in lockdown, and [that had been] the first time I could have a break and be at home around people that I love.
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"It was the happiest I'd ever felt, and I didn't realise that until I went back to work. I immediately became a different person. I had anxiety."
Perrie, Leigh-Anne and Jade have continued as a trio, with the pair paying tribute to Jesy when they picked up the gong for British Group at this year's BRIT Awards.